Yamamoto started 14 races in 2006 and 2007 for now-defunct Super Aguri and Spyker, then run by Kolles, without scoring a point.

Senna has been classified in only three of his races so far, with his 16th-placed finish in Malaysia and China his best result this season.

At the most recent European Grand Prix in Valencia, Senna and Virgin Racing's Timo Glock were called to the stewards after they collided while fighting for position in the race.

Senna, who made his F1 debut at in Bahrain this season, finished runner-up in the GP2 support series in 2008 and started on pole at Silverstone in that championship as well as in Formula Three, but this weekend will be kicking his heels.

Kolles would not say why the Brazilian had been dropped but the team is due to issue a statement on Friday.

Hispania are one of three new teams this season and after not scoring a point they are understood to be fighting a battle for finances as well as one on the track.

BBC links

This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.